Double acting engine



oct. 24; 1933. AJ. PAIGE 1,932,142

l DOUBLE ACTING ENGINE Filed Aug. 6, 1931 A TTORNEYS.

Patented Oct. 24, n 1933 ,UNITED STATEs v l 1,932,142 DOUBLE ACTINGENGINE Arthrfmrai'ge, Detroit, Mich.

Application August 6, 1931. seriarNatsseo s claims. (c1, 12s- 57) Thisinvention relates'to internal combustion enginesV employingreciprocating pistons and more particularly to engines of the doubleacting type. l

An object of this invention is an engine includring a block having acylindrical bore and a coaxial cylindrical counterbore, the 'blockhaving passages leading into the counterbore, for admitting an explosivemixture thereinto, at the lower and upper ends of the latter. Slidablydisposed within the bore Vand counterbore of the block is a hollow trunkpiston having an annular ledge at its upper end. The skirt of the pistonslidably engages the wall of the bore and the ledge slidably engages thewall of the counterbore. As the explosive mixtures, introduced as abovedescribed, are ignited alternately, force is imparted to the piston,first on the under side of the ledge to drive the piston upwardly, andthen on the top surface of the ledge to drive the piston downwardly.Above the block is a water cooled jacketed head having a cylindricalwater filled part projecting into the piston thru the top end of thelatter. Connected to the piston near its lower end and projecting thruthe latter is a connecting rod which may be connected to a crank in theusual manner.

If desired, the upper portion of the piston skirt is made slightlysmaller than the lower portion so it will clear the upper Wall of thebore.

Still further objects will readily occur to those skilled in the artupon reference to the following description and the accompanying drawingin which The figure shows in cross section an embodiment of theinvention.

Referring to the drawing, it Will be seen that there is provided a blockcomprisingv two parts, denoted 10 and 11, respectively, these partsbeing bolted to and engaging each other on the parting line indicated at12. The part 10 is provided with a cylindrical bore 14 and the part 11is provided with a cylindrical counterbore 16 coaxial with the bore. TheWalls ofthe block parts 10 and 11 are made hollow so as to providejackets for the cooling medium, indicated at 18 and which in general, iswater. A head 20 is disposed above the block and is secured thereto bybolts, the head and block engaging on the parting line 22.

Disposed within the bore and counterbore is a piston 26 having open endsand having at its upper end an annular ledge 28. The latter is of such adiameter that as the piston reciprocates in the bore and counterbore theledge slidingly engages the wall of the counterbore 18, and the lowerportion of the piston skirt, slidinglyv engages the'wall of the bore 14.The portion between the ledge and the lower portion of the skirt is madeslightly smaller than the latter, so that as'the piston reciprocates,the upper portion will clear the wall of the bore 14, in a mannerreadily seen.

The block is provided with passages 30 and 32 'controlled by valves 33and opening yinto the counterbore. These passages which are like theusual inlet valve passage in the ordinary autoproperly timed for thispurpose. When the mix- 'ture in the counterbore below the ledge 28explodes due to the action of the spark plug 36, y

force will be imparted against the under surface mobile cylinder blockadmity explosive mixture -into the counterbore alternately, the valvebeing plug 39, force will be imparted against the upper surface of theledge, driving the piston downwardly and imparting a downward thrustupon the connecting rod. Suitable cams indicated at 40 and mountedv uponcam shaft 41 valves 33.

An important feature of the invention resides in the construction of thehead 20. The latter is provided with a cylindrical cup shaped part areprovided to .actuate the 46 which is disposed within the hollow piston,projecting thru theA open end of the latter. The

interior wall of the piston engages the exterior of thiscylindrical partand as the piston reciprocates it is correspondingly guided by thelatter as well as by the engagement of its skirt and its*-` ledge withthe walls of the bore and counterbore. Further the cylindrical part 46of the head being filled with a cooling medium such as water,

cools the piston eiectively as'can readily be seen.

While exhaust passages, exhaust valves, etc.

have not been shown, it will clearly be understood that such areintended to be provided, the disclosure being merely indicative ofapplicants improvement per se.

Now .havingk described the invention and the-y preferredembodimentthereof, it is to be understood that the said invention is tobe limited, not to the specific claims herein set forth, but only by thescope of the claims which follow:

What I claim is:

1. In a reciprocating piston type internal combustion engine, a cylinderblock having a cylindrical bore and a coaxial cylindrical counterbore, areciprocating piston in said bore and der .and having@n.lgieralfqomblisiioe =henbe1lgt .each endfthereof, .enamel ,miinternal 06011.11@

counterbore and having an annular ledge, integral With the skirt of thepiston and slidably engaging the Wall of said counterbore, the skirt. ofthe piston slidably engaging the Wall of the bore, and a jacketed headdisposed on said block and covering the bore and counterbore, the upperpart of the piston skirt having an external diameter slightly less `thanthat of Ithielovirer part of the piston skirt yvhereloy the upper'part'will clear the Wall of the'bo're, as the ypiston reciprocates.

2. In an internal combustion engine having a crankcase, a crank shaftand a connecting lrod l concentric portion of the cooling means, andbeing' rvr substantially cylindrical throughout its length below saidshoulder With that portion operating only in the guide cylinder having aslightly greater diameter than the portion operating in the operatingcylinder. v

' 3. In an internal combustion engine having a cranlgcase with a L,ylinder mountedvthereon, said Qylinfder havigcoolingmeans',an.ope'rating cyliride 'Ilit'ed 'thereon inaxial'alignmenttherewith and Aof larger diameter than the first mentioned cylinder,said larger cylinder having a therein, a guide cylinder mounted on saidcrankl-"Gonbustion chamber open to each end thereof,

case and into which said rod extidsfcboling" means yfor said cylinder, aguide pistonjnsaid cooli11g"'rneans for said operating cylinder including 7exterrvial cooling means and a jacketed cylinder connected tosaid rod andp'ro'vid'ed lniith" "le'adhaving a' cylindrical portionextending into packing rings, said pistonbein'g open'iat its upei perend, an operating cylinder of largerV .diainhetervh mounted upon andcoaxial with the g`ni`o'l`e"cylin`l en, the internal viding anannular'charnloer, anextersion oi'said ,lthe cyllr'ldric';al! 'headextensionandtheiinner Wall Y piston,havinganfannular ,Sh'oilliefbsttany@extensive-111 are@ with Seidfhgmlf Seid vision being closed at itsupper end'by saidcylindrical of said piston adjacent thereto.

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